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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecccc2d157b4c86403ef17dc53e1d627a40894d4a668ef91e094ed95ffb1ced6' 
  AND token = '4zOEmDNZIgQlQbQ+PXfPxrDg8I3/CKBEiM9aNWL5ccw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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