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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52e633250356d1e2d7f048a8d330d19cbb46181e0538b53c31ba0224d33482bc' 
  AND token = 'Zd0CL8fe1i1pTVggL9EZKFgY0+QdPIxyi6/O3SqxR4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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