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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dc1074987195321b95c0b814c177bc4542fcf5ba9410279033ff95743cd18c2' 
  AND token = '8gxt5HmLVn4/TCweYWZloUCFA5j0rJrcL4ffcJl/ESg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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