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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecf39479c7d860f0fec5734fdf6b9da05c4aae5dfd006a90ad682ea1b29b8706' 
  AND token = 'S0/fYnf3BfeZ7hYZm1I4BcKW01F3JmqA6byn31UJvP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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