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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '924ff574d72699a6b9a217dfe28d522f0a2a1ff94935a598e6def5a7c5d49d87' 
  AND token = 'TRCYv+k/m6LWrae2RBjTrMu5O0NUmNwuxBYN5F/oORM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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