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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83d8055644893cdfdbd1ef48c9121af7e9a5d38feb220c83496b35801cc30cdb' 
  AND token = '/R5zlZlELcOVhmGCjPTA8Rl775kPtq+q70bBE1McP3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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