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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5702342b130f759efc711fcede2696308d65664dc0b3f35a747ba9718896a92a' 
  AND token = '4n30uaLlY2sYMJKepNnwhMbmkD1TKKOLGoU501r6ORo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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