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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '131bf5ff9db0a3ae05a63697bf145ae35c467663d26243008ce6441c3b623122' 
  AND token = 'M2CROh0hHAuOslkw+mzVYa+rJF+kTko0mtfkj3G71i8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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