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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32c1f4763241735a8ee11057c3fc1bcc1b516ba1d5313c2bdb89b60a096bb392' 
  AND token = 'QGaOhr3TF9pbAZrA19YLKc6mzqBz9dpL8U3AYuzT0R0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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