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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0774ce976b926ea4a98933139402a58ef670dffa6c314e8327d65c037c26539' 
  AND token = 'i6bgmiw8bbCYMBaZ/efuLkGTYFKZ0IRfkjj+Sk7FT24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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