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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71e2809af4646cc06113547f047aed821d770a5c2ca9004a1b0cbab43689717b' 
  AND token = 'v/itBaEq9MkfEV/JdBgo7gpvXZ8OatSIDyIEywdREPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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