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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62e56b2675e5d85f8c2acdd72b87b13b9aa2977f8de10b951c27b46dca88fcfe' 
  AND token = 'vJc5GN1K3mTq6RH3xRtJwDn453nXK37QjmQRD4cy4fM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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