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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7606242429cc461c1942a210ad6d5d989204a8bad77b58a77985d68109d53e0b' 
  AND token = '8w7aI9ygC/y4McVJBpOwqbfULNzgUR6hExeOP004XSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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