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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f17f20f27f99ef2d33122d0e0c19c9af045c753ae5f725fdd9fbed6cbeec39a0' 
  AND token = 'MyzRxw8+aBRnba12XRY20X4t/B59gLHXUpD4MLT3kYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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