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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faaca852cde5b08a6eeec338dee1c007d1245f26205cb68c737ccc0706b48e2e' 
  AND token = '6dwxgT8ul3zIxWGLXBLufJLbhCHYf5hqFMP2Rp4HI4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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