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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf752314684ec84064fd0e595af956d77d15f319cc115e8deaf98be714f5512e' 
  AND token = 'reZMEpf/H0m8CN2Ywx0Hmr2hhohBACGtGg9LS6eTrQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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