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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e59becffed57fa75d99c81568a96d3663fe818ec73c3a7167ed1454c77ce4d44' 
  AND token = 'bW0sELmC02Y3aaTdRt8v2lDquxnF/xPM6VNS0f90CkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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