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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38a8e985cd4317a21692397f1e7a1c7ac96fdc3b56e5dd1559d6fa8f4ebf101a' 
  AND token = 'SYV11OrxvVRTR66KCEG3zPWwtq2+2wHzOKxtOeUYpfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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