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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ef03767d2432385f6c39d086200bf037dbb02d112bbf5bd2b17c4cebbdbe1dd' 
  AND token = '5WNa29eTwqMO88Ck+HsTKBX5CsbFzQk0kdgtKwJWY+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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