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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82dfc853b836ca325e48c7515fa98f9c5855f53163c7b6a71fb40f2609bcf6b0' 
  AND token = 'Joma3XS9jhGm1izcrjif1Ds0qXDjfPH+3g/f2ohNJhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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