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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '788167364262e7b2b19cc7ac0bf03f31adfd6b914657a7c414bf312830c9e4c7' 
  AND token = 'zjX4KDAn3joicKJOEVXxKAucfn75JdfdE5pA8t9qYbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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