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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74c0f656a370c1a816d69b7cb03f37f2cfff447aba61fef7432ee11736d0f2a2' 
  AND token = '982Bvmf/r1oONG6/YpL9VKIPJWMx40ea+xHlxJQBOxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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