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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1625e26ae42d9dbedebe111b2414a285d764252980726eba2fd59a52d70cf686' 
  AND token = 'DQMLZP7E1TZW2vMNdw0Mo0ZILRya4qv0geYmC7SRiCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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