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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0fde76bd40bb7a1659bb320d02b07d0c15a04eac7e4abfdc0d8dd50c65d539f' 
  AND token = 'fwAwq/yCX1ulgWu2M59ZvkodZ9QKB6OtDZDm0NSBFdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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