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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40f12aa64091cd3494161ed14d70e5554743361e1a99c9aea5458e110209b877' 
  AND token = 'AIOS6JoM5QZtKG75SeH+vqVd4mRH/KOFKo7gL/Mg+9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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