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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52b41252202763f2eb9c8880770c89cfbd1147276a73b96b00df05a0adf6c7fb' 
  AND token = 'awKaA3fXvbMOqk4Ng3Pt6T3d/5ijqzKrWMzJf7wIG8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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