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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edbc514dfaf8adc851bfe9d8ff731d5214a14d56e661bdecd93969975fc62eff' 
  AND token = 'poh7CdALxcGTLTUntJfbb02F5myX82Hm4722EvGIPr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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