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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c524cc4849cb7927b5281d743d0daabee58ec01d9f8b80a4f34aa3613f2dc0e9' 
  AND token = 'a293iim6x5hDw9Xjc0mqVMk9KraJixM4CfPCv9pwO/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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