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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd717014a328fdcf27fbfc31823b0ab9fefdc0e83a76f7d1d4ec43dca4cb9d955' 
  AND token = 'pYcJddlfB0CmHwLngJetXpybPp+UmYzDPxNJpaGGAGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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