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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df521553f0117b6552f33859421dfb0d9fdb64ece19d7a0f4bf932bc972aa609' 
  AND token = '2oToQL/i3eKvZuzS4PTpA9JQeR9MUIwKog/bN0NjrWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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