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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ad9f2690c151c0450130c74af7bf073a94cd1afecd24621ac89af9aa0ae423f' 
  AND token = 'pjvu9GWjxf9QZvEvPpycG7uDgs8Ub6mZd7n/xpDtFaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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