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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90b6d10d32ef5212e7db6a2d6c6fb8369c559eb6aa2fa606787b6d83406584eb' 
  AND token = 'aIBTUhufz9s3LEC2wL3Upvb163ruyUW6hT7P6YAgzLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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