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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4220a5258c129e280696e693b5d2cd11203d10b25b096ac179a2d35c4b9bb696' 
  AND token = 'h8/5b5R9X9/89PtHm06B2SICWBuJpc5+pDXGSLx0B/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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