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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '023c8a58dd3d00b20df8384a935e0f039cbc572ebf3f51c5c5d3f36b0c708040' 
  AND token = 'zAj/KATwkjkWSD5nSHwybJnt1COcyb3X089sr/frhTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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