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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8812c496b35911edf2decb62f56b895343d73dea40a05d54c5a8dc870d43c11' 
  AND token = 'FH1ok9zlgME4AKuNj/4PoL2YE6AMSxaZH6p0YgTVI4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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