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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34c3d59a0739445eba0d5fe9ce74f03836ec41ca7e25fbf14b6f9e20a252cfb7' 
  AND token = '1T6zeOZr3s5E9RN9oaqhqyYjB61o3vFm1cfbCGcBMjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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