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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a2b467c3cbd9043a1e0abec108a15ce522ae10c4f8fad94e2809a3d72298eca' 
  AND token = 'Fk6WNBVq8BD90mDgJT9cDYEjNHZiCDSfFgnkgr5ddkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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