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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94db8820584ec0da2cda2bc4589245bed5f4afb972193e0bb9e04d2b91fe77dd' 
  AND token = 'EVfFzL2+EqNYCglQoP4opl29xXSC7xRM2MH3a9u8vpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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