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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c6d4e9158be06e0350c11200e782a1268e3d72451e6b16b5103a633d2bc96f2' 
  AND token = '+iCqhIqrz99Q97qyl2rqzj6b77nc+rFNGDuQgrrT/Rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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