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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3775462f02814dfce4f6cd245d0ef28de4a469dc8fe4df0f3aefd4cce7cc1336' 
  AND token = '6dY4dZSTu5AcHZ0QtUqcrvPfcnPhxZEi2+EUCdxQ8SQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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