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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f19cc4dd769ecf5afd865d9a229c73d673561c9795c613d5d8275d03e47d6e0' 
  AND token = 'RdZEX5KUv3plz0GrbnS9vPcxPU9Gu259hhgAdKYoda0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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