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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f3e01ffc06c203f8c013130899e11274ec1c0dd432770e5697c6ef1456c02aa' 
  AND token = 'aGh2/MhGODUu+NnqpTXrOvCCry4/d101KeMVXglCo4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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