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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0cda4cdc49ca9f1daeccd3fc0208f15622fe720dbc1ac0b6c94520e64518564' 
  AND token = '+XoK8isMjGgKyX7MOH6H501C7HVjMk380prHZ7hQje8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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