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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7cab3763a9c419875b57f44a1fc17f39863ad48ce52ae830cbc412abfa8f179' 
  AND token = 'n9ifIoyg3CCV2ViX8BBy1O2Ir6w0aFuJflMvDZ3Q5cI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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