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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb26f22f69e93afa29af5cdca3741ab16858c506d56cd11089b2cbe6fb02e173' 
  AND token = 'fa1Yvtcpvcf39GAa8w4RVqBiXRr6ii7OOrMKdH9HbKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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