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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07b5bf32b9ea5c6e77de6d758448ded38b0e3e33c8e02380d18b27af76a041c9' 
  AND token = 'Rr4sRcl7+7Pzdg9/JDkKvn7ep73yj08vNK3KicDvnew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}