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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6abde45617a6338ce7f73ae54436d36f3232e092e4b5be906a109edc02b4d791' 
  AND token = 'DHsuKPsKwFyjLgw6Fo/QiJS79si1YDOTlDqQ5QB3blk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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