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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3516151c11e5932d44db141df735730760572a8625b9512c2a9a75b2a29f0e1' 
  AND token = 'BuRucsKGQN8wcwyio0RVSaa/OzJCA5s7PoD4dbXn0yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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