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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae2f551fb3173334ba4d954e2bd372c4d14b91b0d79d0c6e25b11a15022f0c6b' 
  AND token = 'Fd75iGdNgW2+QolfryrcnL9GmlRleM/q0BBKcSQErwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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