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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '896d37afb4915f521a4bccdd9bf43d0c4042ab136ef6cc18104024879ea0671f' 
  AND token = '5aeNJkqFO8aGB7nj5+TGeBSMTcSh18HkvUCkoXcEs7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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