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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd11ebaaff5f24ab137f9c34cac5daadb65e45af08bd88e05a942f2f38556d02' 
  AND token = '7afxLw8dacZ+3bzz0cYtX9hETkKzvZXhbIei2TRsPOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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