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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06db343341a39d80de1773ba696b6e62e6d67b7739248f546869141440bdd97d' 
  AND token = 'fkOjCY7eztYMW6+CYr/6o4RBQStDpEm4x8I5ECk3ea8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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