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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e27dc84aefcc7aa5f6f035cb944c3711cd1d4fdec88a83c94e9af22f12c4e5e' 
  AND token = 'eHxrV6DcyFwCX7+IlciQPpI+p3R3FhO07AUoB5vNZic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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