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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66536b076937a6a33c880346f8f833bb5ebc2b723b880fc5f9f33d6b7f461de2' 
  AND token = 'RVnJPfR/fPTWEcgsy0mqZxadqmPM/Xs0y/wKHEKmoLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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